Roddick, 26, and Decker, 21, plan to celebrate the nuptials with two days of festivities near Roddick’s Austin, Texas, home. “They wanted to keep it local,” the source says. And very private. The pared-down guest lists includes mostly family and a few close friends of the pair, who met when Roddick spotted Decker in a magazine and asked his agent to find her number.

But part of the celebration is already in full swing. This past weekend, the festivities kicked off with a bachelorette party in Decker’s native North Carolina, and included her bridesmaids, including fellow S.I. model Julie Henderson.

Of their then yearlong courtship, Decker told PEOPLE last May, “I was stalked. He’ll tell you that,” she joked. But “it was charming. He was charming. Eventually, I fell for it, and five months later I called him back and that was that.”

She added that planning for her wedding was surprisingly fun: “This has been the happiest time. I’m very much a tomboy and this is being a total girl, being with my friends and my mom. We’re shopping for a dress right now.”

Roddick has also expressed his excitement. “We feel lucky to have found one another,” Roddick told PEOPLE last March, after he had popped the question to his girlfriend, and even joked of her Tiffany engagement ring: “I got it in a gumball machine.”